Daikin R-410A Installation Manual page 37

EDUS39-605
Pay special attention to places such as a basements,
where refrigerant can stay because refrigerant is heavier
than air and precautions must be taken.
Procedure for checking maximum concen-
tration:
Check the maximum concentration level in accordance
with steps 1 to 4 below and take whatever action is nec-
essary to comply.
1. Calculate the amount of refrigerant (Ib.) charged to each
system separately.
amount of refriger- additional charging
ant in a single unit + amount (amount of
system (amount of refrigerant added
refrigerant with locally in accordance
which the system with the length or
is charged before diameter of the refrig-
leaving the factory) erant piping)
NOTE
Where a single refrigerant facility is divided into 2 entirely
•
independent refrigerant systems, use the amount of refrig-
erant with which each separate system is charged.
Calculate the smallest room volume (ft
•
Incase like the following, calculate the volume of (A), (B) as
a single room or as the smallest room.
A.Where there are no smaller room divisions
B.Where there is a room division but there is an opening
between the rooms large enough to permit a free flow
of air back and forth
opening between rooms
1.
partition
2.
Where there is an opening without a door or where there
are openings above and below the door which are each
equivalent in size to 0.15% or more of the floor area.
2. Calculating the refrigerant density using the results of the
calculations in steps 1 and 2 above
total volume of refrigerant in the
refrigerant system
3
size (ft ) of smallest room in which
there is an indoor unit installed
Installation of Outdoor Units
total amount
= of refriger-
ant (Ib.) in
the system
3
)
.
1
2
.
≤
maximum concen-
tration level (Ib./ft
If the result of the above calculation exceeds the maximum
concentration level then make similar calculations for the
second then third smallest room and so until the result falls
short of the maximum concentration.
3.
Excess of maximum concentration level: If the installa-
tion of a facility results in a concentration in excess of the
maximum concentration level you must revise the system.
Please consult your Daikin supplier.
3
)
Installation
36